In a near future, crimes and accidents can be prevented by making just one phone call to the past. However, the peace of this utopian world will be disrupted by a methodical killer who seems to have discovered the only flaw in this system.

In the near future, a special force of agents is dedicated to saving people using special mobile phones, with which they can call the past or the future. The world seems like a perfect place until the appearance of a relentless, methodical and thorough killer. David, the finest agent in the Force, will be in charge of finding and catching this murderer before this idyllic society collapses.—exe_malaga93